US759419A - Rotary engine. - Google Patents

Description

No. 759,419. l PATBNTBD MAY 10; 1904. A. 1a. CHAPMAN.

ROTARY ENGINE.

APPLIoA'rIoN FILED P11025, 1904.

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UNITED STATES Patented May 10, 1904.

PATENT QEEICE.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 759,419, dated May 10, 1904.

Application iled February 25, 1904. Serial No. 195,160. (No model.)

T0 au whom, t may concern:

Be it known that I, ALBERT B. CHAPMAN, a

citizen of the United States, residing at Silvercreek, in the county of Chautauqua and State of New York, have invented certain new and useful Improvements in Rotary Engines, of which the following is a specification. f This invention relates to rotary engines; and it has for its object the production of an engine of the class mentioned which is simple and durable in construction, free in action, and by means of which the maximum eliciency may be attained by the minimum eX- penditure of the power-producing medium.

To these ends the invention consists in the novel construction and arrangement of parts to be hereinafter described, and more particularly pointed out in the appended claims.

In the drawings, Figure l is a transverse vertical section through my improved engine. Fig. 2 is a vertical section taken on line 2 2, Fig. l, looking in the direction of the arrow crossing said line. Fig. 3 is a vertical section taken on line 3 3, Fig. l, looking in the direction of the arrow crossing said line. Fig. 4 is a vertical section taken on line 4 4, Fig. 1, the piston being removed to show one of the heads of the cylinder. Fig. 5 is a section taken on line 5 5, Fig. 3. Fig. 6 is a detached perspective view of one half of the cylinder on a reduced scale. Fig. 7 is a detached perspective view of the piston on a reduced scale. Fig. 8 is a detached perspective view of the other half of the cylinder.

Referring to the drawings in detail, like letters of reference refer to like parts in the several figures. v

The letter A designates the cylinder of the engine, formed in two sections a a', around the circumferential walls B of which an annulus C is held, the said sections and the annulus being rendered steam-tight in any practicable manne'r and being secured together as may be desired. Each cylinder-section is provided with an induction-port D and an eduction-port E. Passing centrally through the cylinder is the engine-shaft F, to which is secured within the cylinder the piston Gr.v

The circumferential surface of the piston is provided with two parallel rows of coinciding pockets H, which are open on the sides of the piston and are so spaced with reference to the induction and eduction ports that when two such pockets are held in communication with tion-port and an eduction-port each series of pockets H is furnished with such ports and the steam may be cut off at one side of the engine, if desired.

At diametrically opposite points of the cylinder one of the transverse walls J of each row of pockets H is much wider than the remaining transverse walls, and the radial sides K of said wide walls serve as the main working faces for the steam. This, however, is not necessary; but, if desired, the said wide walls rnay be arranged at coinciding points.

The inner faces of the cylinder-heads L are each provided with a circular series of depressions or recesses M, forming, in effect, an interrupted passage. The said recesses are arranged to overlap each other, and when the piston revolves each recess M communicates with the pockets H in pairs successively. The induction-port and the eduction-port in each cylinderhead opens into the end recesses, which are enlarged and provided with radial -side walls N. The enlarged end recesses M vare separated by an intervening abutment O,

which serves to check the passage of ythe steam through the pockets H by closing communication between any two adjacent pockets H as they pass the said abutment. A The ports D and E may be used interchangeably as induction and eduction ports, depending as to whether the engine is to be run forward or reversed. I have, however, designated one port as the induction-port and the other port as the eduction-port, having reference by such designation to the pistonrevolving in a forward direction, as designated by arrows in Figs. 2, 3, and 4.

The steam admitted into the induction-ports D in the heads of the cylinder enters the enlarged end recesses M and is directed into the pockets H of each series of pockets registering with said enlarged recesses. The steam passes from the said pockets into the next recess M in the series and from the said recess into the next pocket in the piston, continuing in its course and expanding through the successive pockets H and recesses IWI until it reaches the last pockets in the two parallel series of pockets,` when its force is exerted against the working faces K, which causes the piston to be revolved until said last-mentioned pockets reach the eductionports, where the steam exhausts. During the course of the steam from the successive pockets to the working faces of the piston the steam also acts against` the advance radial wall of each pocket, thereby aiding in revolving the piston. The radial faces of the abutments O in the induction-recesses serve as the head of the cylinder and causes the steam to be led and expand in the opposite direction, while the radial faces of said abutments in the eduction-recesses checkthe further progress of the steam within the cylinder and compel the steam to exhaust through the eduction-ports.

If desired, the recesses M may be formed in the circumferential wall of the cylinder, or the principle of this invention may be otherwise applied, without affecting the efliciency of the engine or sacriiicing any of the advantages of the invention.

By the foregoing, taken in connection with the accompanying drawings, it is apparent that high eciency is obtained by the expenditure of a minimum amount of steam, that the steam will be exhausted from the successive pockets without the use of valves in the exhaust, that by reason of the abutment O the steam is directed in one direction only, and that the steam travels through almost a complete revolution, whereby aperfect utilization of the expansive force of the steam is obtain ed.

Having thus described my invention, what I claim is- 1. In a rotary engine, the combination of a casing having an induction-port and an eduction-port and being provided with overl-apping recesses arranged in a series extending from said induction-port to said eduction-port, apiston having a series of pockets, the last pocket of the series having one of its walls serving as aworking face, and each of said recesses being at all times in communication with two of said pockets except when the space between the rst and the last pocket of said series of pockets registers with a recess.

2. In a rotary engine, the combination of a piston having a series of pockets, the end pockets of said series of pockets being separated by a wider space than the remaining pockets, a fixed element in contact with the said piston and being provided with an induction-port and an eduction-port, and means whereby the power-producing medium may pass from the induction-port through the successive pockets between said induction-port and the last pocket in the series, and from said last pocket and the preceding pockets in the series out through the eduction-port.

3. In a rotary engine, the combination of the cylinder having an induction-port and an eduction-port and being provided with a series of recesses, a piston having aseries of pockets each of which is brought successively into registration with the successive recesses in the cylinder, the end wall of the last pocket of said series of pockets serving as a working face against which the steam is directed when passing and expanding through the recesses in the cylinder and the successive pockets in the piston.

4. In a rotary engine, the combination of a cylinder having a series of recesses in each head, the first and last recess of said series being' separated by an abutment to check the ,passage of the power-producing medium, a port opening into the first recess and into the last recess of the series, a piston having two series of pockets, each series having its end pocket separated by a space corresponding to the said abutment, the end wall of either end pocket serving as the working face of the piston.

5. In arotary engine, the combination of the cylinder having an induction-port and an eduction-port and being provided with an interrupted passage extending from said inductionport to said eduction-port, a piston having a series of pockets, the end wall of the last pocket of the series of pockets serving as the working face of the piston, the said interrupted passage in the cylinder-head and the successive pockets in the piston serving as a means of leading the steam to the last pocket of the said series of pockets, the steam in the said last pocket and the preceding pockets in the series exhausting as they pass the eductionport.

6. In a rotary engine, the combination of the cylinder provided with an induction-port and an eduction-port and having an interrupted passage extending from said induction-port, a piston having a series or' pockets which regis- -ter successively with the several parts of said passage, the end pocket of the series serving as the working ace of the piston and the end of said passage adjacent to said induction-port serving as an abutment and causing the steam to be led through the successive parts of the said passage and'the pockets in the piston registering with such parts of said passage.

7. In a rotary engine, the combination or' a cylinder having two ports capable or' being used interchangeablyas induction and eduction ports, a piston having a series of'non-communicating pockets, and means for causing the steam to enter and pass out of said pockets TOO IIO

successively until the last pocket in the series is reached.

8. In a rotary engine, the combination of a cylinder having an induction-port and an eduction-port and being provided With overlapping recesses between said ports, a piston having a series of pockets providing two opposite Working faces between the end pockets of said series, each pocket being adapted to register I0 with tWo of said recesses When traveling from the said induction-port to the said eductionport, as and for the purpose described.

In testimony whereof I have affixed my signature in the presence of tWo subscribing Witnesses.

ALBERT B. CHAPMAN.

Witnesses:

EMIL NEUHART, M. SEWERT.

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